Bright Free Exciton Electroluminescence from Mn-Doped Two-Dimensional Layered Perovskites | Zendy

Liangdong Zhang | Zendy; Tao Jiang | Zendy; Chang Yi | Zendy; Jiquan Wu | Zendy; Xiaoke Liu | Zendy; Yarong He | Zendy; Yanfeng Miao | Zendy; Ya Zhang | Zendy; Huotian Zhang | Zendy; Xinrui Xie | Zendy; Peng Wang | Zendy; Renzhi Li | Zendy; Feng Gao | Zendy; Wei Huang | Zendy; Jianpu Wang | Zendy

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Bright Free Exciton Electroluminescence from Mn-Doped Two-Dimensional Layered Perovskites

Author(s) -

Liangdong Zhang,

Tao Jiang,

Chang Yi,

Jiquan Wu,

Xiaoke Liu,

Yarong He,

Yanfeng Miao,

Ya Zhang,

Huotian Zhang,

Xinrui Xie,

Peng Wang,

Renzhi Li,

Feng Gao,

Wei Huang,

Jianpu Wang

Publication year - 2019

Publication title -

the journal of physical chemistry letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.563

H-Index - 203

ISSN - 1948-7185

DOI - 10.1021/acs.jpclett.9b01326

Subject(s) - exciton , electroluminescence , perovskite (structure) , materials science , photoluminescence , doping , light emitting diode , phonon , optoelectronics , octahedron , crystallography , condensed matter physics , crystal structure , chemistry , nanotechnology , physics , layer (electronics)

Two-dimensional (2D) perovskites incorporating hydrophobic organic spacer cations show improved film stability and morphology compared to their three-dimensional (3D) counterparts. However, 2D perovskites usually exhibit low photoluminescence quantum efficiency (PLQE) owing to strong exciton-phonon interaction at room temperature, which limits their efficiency in light-emitting diodes (LEDs). Here, we demonstrate that the device performance of 2D perovskite LEDs can be significantly enhanced by doping Mn 2+ in (benzimidazolium) 2 PbI 4 2D perovskite films to suppress the exciton-phonon interaction. The distorted [PbI 6 ] 4- octahedra by Mn-doping and the rigid benzimidazolium (BIZ) ring without branched chains in the 2D perovskite structure lead to improved crystallinity and rigidity of the perovskites, resulting in suppressed phonon-exciton interaction and enhanced PLQE. On the basis of this strategy, for the first time, we report yellow electroluminescence from free excitons in 2D ( n = 1) perovskites with a maximum brightness of 225 cd m -2 and a peak EQE of 0.045%.

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